Scenario $5-2$

Suppose the demand function for good X is given by: where is the quantity demanded of good X$,$ is the price of good X$,$ and is the price of good Y$,$ which is related to good X$.$

Refer to Scenario $5-2.$ Using the midpoint method, if the price of good X is constant at $$10$ and the price of good Y decreases from $$10$ to $$8,$ the cross price elasticity of demand is about

Group of answer choices

$0\mathrm{.}57,$ and X and Y are substitutes.

$-0\mathrm{.}22,$ and X and Y are complements.

$-0\mathrm{.}80,$ and X and Y are complements.

$-2\mathrm{.}57,$ and X and Y are complements.